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          <h1 class="post-title" itemprop="name headline">Java访问HDFS集群</h1>
        

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        <p>学习用Java访问HDFS集群。<br><a id="more"></a></p>
<h2 id="客户端搭建"><a href="#客户端搭建" class="headerlink" title="客户端搭建"></a>客户端搭建</h2><p>网上说： 配置的每一个集群节点都可以做一个Hadoop客户端。但是我们一般都不会拿来做集群的服务器来做客户端，需要单独的配置一个客户端。</p>
<p>通常情况下我们写完程序，需要打包成jar传到集群中的某一个节点中，用hadoop jar命令运行。</p>
<h3 id="windows环境下搭建hadoop"><a href="#windows环境下搭建hadoop" class="headerlink" title="windows环境下搭建hadoop"></a>windows环境下搭建hadoop</h3><ul>
<li><a href="https://github.com/Fespinola1/HadoopWindows7" target="_blank" rel="noopener">HadoopWindows7</a>克隆到本地</li>
<li>修改etc/hadoop/hadoop-env.cmd中JAVA_HOME</li>
<li>修改etc/hadoop/hdfs-site.xml中的目录</li>
<li>将bin/hadoop.dll复制到C:\Windows\System32中</li>
<li>将HadoopWindows7配置到环境变量HADOOP_HOME</li>
</ul>
<p>完成后，就成为一个本地的伪集群了。后面可以拿它本地测试。</p>
<h3 id="如何启动"><a href="#如何启动" class="headerlink" title="如何启动"></a>如何启动</h3><p>类似linxu下，我们在sbin目录下执行start-dfs即可启动.</p>
<h2 id="API介绍"><a href="#API介绍" class="headerlink" title="API介绍"></a>API介绍</h2><h3 id="HDFS的Java访问接口"><a href="#HDFS的Java访问接口" class="headerlink" title="HDFS的Java访问接口"></a>HDFS的Java访问接口</h3><ul>
<li>org.apache.hadoop.fs.FileSystem，文件系统的访问</li>
<li>org.apache.hadoop.fs.Path，对文件系统路径的抽象</li>
<li>org.apache.hadoop.conf.Configuration，读取、解析配置文件(如core-site.xml/hdfs-default.xml/hdfs-site.xml等)，或添加配置的工具类</li>
<li>org.apache.hadoop.fs.FSDataOutputStream，输出流</li>
<li>org.apache.hadoop.fs.FSDataInputStream，输入流</li>
</ul>
<h3 id="Java访问HDFS主要编程步骤"><a href="#Java访问HDFS主要编程步骤" class="headerlink" title="Java访问HDFS主要编程步骤"></a>Java访问HDFS主要编程步骤</h3><ul>
<li><p>构建Configuration对象，读取并解析相关配置文件</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Configuration conf=<span class="keyword">new</span> Configuration();</span><br><span class="line"><span class="comment">// 设置相关属性</span></span><br><span class="line">conf.set(<span class="string">"fs.defaultFS"</span>,<span class="string">"hdfs://IP:9000"</span>);</span><br></pre></td></tr></table></figure>
</li>
<li><p>构建FileSystem对象，操作HDFS文件系统</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">FileSystem fs = FileSystem.get(<span class="keyword">new</span> URI(<span class="string">"hdfs://IP:9000"</span>), conf);</span><br><span class="line"><span class="comment">// 操作文件系统</span></span><br><span class="line">fs.delete(<span class="keyword">new</span> Path(<span class="string">"/data.txt"</span>));</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h2 id="直接连接集群"><a href="#直接连接集群" class="headerlink" title="直接连接集群"></a>直接连接集群</h2><p>不知道为啥别人不推荐直接连接，我直接连接在centeros上搭建的伪集群。直接运行单元测试用例，简单粗暴。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileSystemTest</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> Logger LOG = LoggerFactory.getLogger(FileSystemTest.class);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> FileSystem fs;</span><br><span class="line">    <span class="keyword">private</span> Configuration conf;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Before</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setup</span><span class="params">()</span> <span class="keyword">throws</span> IOException, InterruptedException </span>&#123;</span><br><span class="line">        conf = <span class="keyword">new</span> Configuration();</span><br><span class="line">        fs = FileSystem.get(URI.create(<span class="string">"hdfs://ip(NameNode的公网ip):9000"</span>), conf, <span class="string">"root"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">listFiles</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        RemoteIterator&lt;LocatedFileStatus&gt; it = fs.listFiles(<span class="keyword">new</span> Path(<span class="string">"/"</span>), <span class="keyword">true</span>);</span><br><span class="line">        <span class="keyword">while</span> (it.hasNext()) &#123;</span><br><span class="line">            LocatedFileStatus fileStatus = it.next();</span><br><span class="line">            LOG.info(<span class="string">"fileStatus: &#123;&#125;"</span>, fileStatus);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">mkdirs</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        fs.mkdirs(<span class="keyword">new</span> Path(<span class="string">"/test/a"</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">copyFromLocalFile</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        fs.copyFromLocalFile(<span class="keyword">new</span> Path(<span class="string">"/download/rabbitmq-server-windows-3.7.3.zip"</span>), <span class="keyword">new</span> Path(<span class="string">"/test/a"</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">copyToLocalFile</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        fs.copyToLocalFile(<span class="keyword">new</span> Path(<span class="string">"/test/a/hadoop-2.6.0-cdh5.14.0.tar.gz"</span>), <span class="keyword">new</span> Path(<span class="string">"/download"</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">deleteOnExit</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        fs.deleteOnExit(<span class="keyword">new</span> Path(<span class="string">"/test/a/rabbitmq-server-windows-3.7.3.zip"</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@After</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        fs.close();</span><br><span class="line">        conf = <span class="keyword">null</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h3><p>代码上传到了github，<a href="https://github.com/xuanbo/hadoop-examples/tree/master/hdfs-example" target="_blank" rel="noopener">戳我</a></p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#客户端搭建"><span class="nav-number">1.</span> <span class="nav-text">客户端搭建</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#windows环境下搭建hadoop"><span class="nav-number">1.1.</span> <span class="nav-text">windows环境下搭建hadoop</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#如何启动"><span class="nav-number">1.2.</span> <span class="nav-text">如何启动</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#API介绍"><span class="nav-number">2.</span> <span class="nav-text">API介绍</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#HDFS的Java访问接口"><span class="nav-number">2.1.</span> <span class="nav-text">HDFS的Java访问接口</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#Java访问HDFS主要编程步骤"><span class="nav-number">2.2.</span> <span class="nav-text">Java访问HDFS主要编程步骤</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#直接连接集群"><span class="nav-number">3.</span> <span class="nav-text">直接连接集群</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#代码"><span class="nav-number">3.1.</span> <span class="nav-text">代码</span></a></li></ol></li></ol></div>
            

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